It happened already twice. I am working in one of my layers, I am changing the levels , the image in that layer gets black. I cant undo or go back in history. In the history pallette the original picture at the top goes black. If I try to save, all the layers get corrupted, with missing arbitrary squares in all of them. The first time it happens the missing areas where white, the second time they change to black. The top picture in the history pallette maches the black or white color.

The small picture in the icon in my desktop looks normal , but when open is tottally corrupted. If I have other files open, all of them get corrupted also if I tried to save.

Thank you so much for replying to me. I have Photoshop CS5, version 12.1 extended. I have been using this version for about a year. This is the first time it happen. I have a Mac OS 10.5. Following your instructions I just upgrade to 12.1.1 and just cleared my preferences.

I read about the preferences, the behavior occured not with the tools, but when I tried to adjust the Levels. Moving the arrow left to right, the current layers gets all black. When this happen , I can't undo, or go back in history. Also try deleting that particular layer. The corruption is alredy done, till then everything looks fine, but if I save the file, when I re open , every layer is missing squares, the bottom layer is all blak or white, same with the top image in history. And every layer is missing squares in a random patterns.

Also I have photoshop installed in another identical Mac, same thing happen.(I was using the same files from my hard drive).

I will keep working and see what happen, the episode occured about 2 weeks appart.

Everything seams to be working fine for now, I have also turn of the GL option in the preference panel, but that changes some of the tools, like Rotate the image that I use a lot, so I will turn it on again today to see if it makes a difference.

If there any sensitive info I should be aware before Copy Paste all my System Info here?

Now the wire behavior is happening in my layers selection, they are grey when selected instead of blue, so I can't work at all!

Thank you so much for follow my postings!! I am going crazy because my work depends on Photoshop!

Here is my system info, I have tried everything!, this latest trouble are not affected by turning on and of the GL.

Can Adobe send you a virus? I used to have Abobe suit installed, from a previous Co I work for, but they didn't upgrade the license , I was not using the software but it was still installed in my HD. (I recieved a couple of messages from Adobe to let me know that the license was expired) but I didn't paid attention to it because I didn't used. I was using my license CS5 version.

I already uninstall that. The only other thing I did before all this started was buying Mac Keeper.

(I recieved a couple of messages from Adobe to let me know that the license was expired)

Only Creative Cloud licenses can and will expire. Perpetual licenses never expire. Volume License Agreement does - but this, in no way affects the actual licenses that were purchased during the tenure of the Volume License Period. You may want to investigate the e-mail you received about this to ensure it is legit from Adobe. If not, you may want to contact Adobe Customer Care and let them know about this.

Memory available to Photoshop: 3764 MB

Memory used by Photoshop: 88 %

Your system has a total of 4GB of RAM. You're letting Photoshop use 3764MB - while more the RAM merrier Photoshop experience, you still need to consider the memory needed by your OS itself. You may want to reduce this to about 70% or something to see if that makes a difference at all in terms of in-application processing. To do this, Photoshop (from Menu bar) > Preferences > Performance > Change the area that says 'Let Photoshop Use...'

Plug-ins that failed to load:

Lighting Effects NO VERSION - 32-bit plug-in not supported in 64-bit - from the file “Lighting Effects.plugin”

Send Video Preview to Device NO VERSION - 32-bit plug-in not supported in 64-bit - from the file “FireWire Export.plugin”

Variations NO VERSION - 32-bit plug-in not supported in 64-bit - from the file “Variations.plugin”

Video Preview NO VERSION - 32-bit plug-in not supported in 64-bit - from the file “FireWire Export.plugin”

Photoshop CS5 on Mac OS was reworked on a fundamental level to run as a 64-application under the 64-bit versions of Mac OS. Therefore, old and 32-bit plug-ins don't run, can return errors, or cause crashes when you use them in the 32-bit or 64-bit versions of Photoshop.

To be able to use these plug-ins you need to run Photoshop CS5 in 32-bit mode on Mac OS. To do this, Go to Applications/Adobe Photoshop CS5 folder. Right click the Adobe Photoshop CS5.app > Get Info. Enable 'Open in 32-bit mode' option as shown in screenshot below.

Try these steps to see if any one of them or all of them make a difference.

It ia amazing all the things I am learning! I guess when something goes wrong you are force to do things different. I am not the type that enjoys the technical side of computers and sofwares. Thank you again for all the input.

Regarding the warning sign, it appeard when I try to open a .png file, that launch Fireworks . Fireworks was under CS4 Suit Volume lincese. I do not remember exactly what the warning said, but I unistalled CS4 Suit just in case .I am glad to know that Adobe can not shut you down!

I change to 32 bit mode. I found out that my Mac is a 32 bit About this Mac< more info< Sistem Sofware< 64-bit Kernel and Extensions:No

The plug ins , still failed to load. So I remove the plug in folder and reinstalled CS5 , and now they are working!!! Witch is great, because I always used the Lighting filters, and I thought they were removed from CS5.